grenades exploding as police move in to capture dzhokhar tsarnaev. as the 19-year-old steps out of the boat, police make their arrest and providing him medical care right there on the scene. >> those pictures that's a stun grenade going off right there, three of them used. let me ask you about dzhokhar tsarnaev, what kind of condition is he in now and when will police be able to question him? >> reporter: dan, he's listed in rious but stable condition here, because of the nature of his injuries, authorities haven't been able to interview him, but a special federal interrogation team is on stand by the moment he is able. dan, i think it's worth noting that the suspected killer is being treated at the same hospital where many of the victims of monday's blast were also treated. >> extraordinary. so many questions they want to ask this young man. were there other plotters? we'll see when that happens. charges could be filed as early today. >>> meantime, boston is slowly getting back to normal, a huge sense of relief, but still so much grief. but gio beni